Recently, because of the increasing demand for natural gas and the reduction of greenhouse gases, interests have focused on producing synthetic natural gas (SNG), which is suggested as an important future energy carrier. Hydrogenation of CO 2 , the so-called methanation reaction, is a suitable technique for the fixation of CO 2 . Nickel supported on yttrium oxide and promoted with cobalt were prepared by the wet-impregnation method respectively and characterized using SBET, XRD, FTIR, XPS, TPR, and HRTEM/EDX. CO 2 hydrogenation over the Ni/Y 2 O 3 catalyst was examined and compared with Co–Ni/Y 2 O 3 catalysts, Co% = 10 and 15 wt/wt. The catalytic test was conducted with the use of a fixed-bed reactor under atmospheric pressure. The catalytic performance temperature was 350 °C with a supply of H 2 :CO 2 molar ratio of 4 and a total flow rate of 200 mL/min. The CH 4 yield was reached 67%, and CO 2 conversion extended 48.5% with CO traces over 10Co–Ni/Y 2 O 3 catalyst. This encourages the direct methanation reaction mechanism. However, the reaction mechanism over Ni/Y 2 O 3 catalyst shows different behaviors rather than that over bi-metal catalysts, whereas the steam reforming of methane reaction was arisen associated with methane consumption besides increase in H 2 and CO formation; at the same temperature reaction.

中文翻译：

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使用 Co-Ni 双金属 Y2O3 基催化剂将 CO2 转化为合成天然气 (SNG)

最近，由于对天然气的需求不断增加和温室气体的减少，人们的兴趣集中在生产合成天然气（SNG）上，合成天然气被认为是未来重要的能源载体。CO 2 加氢，即所谓的甲烷化反应，是一种适用于固定CO 2 的技术。分别采用湿法浸渍法制备氧化钇负载镍和钴助催化剂，并使用 SBET、XRD、FTIR、XPS、TPR 和 HRTEM/EDX 进行表征。研究了 Ni/Y 2 O 3 催化剂上的 CO 2 氢化，并与 Co-Ni/Y 2 O 3 催化剂进行了比较，Co% = 10 和 15 wt/wt。催化试验是在常压下使用固定床反应器进行的。催化性能温度为 350 °C，供应 H 2 ：CO 2 摩尔比为4，总流速为200 mL/min。CH 4 产率达到67%，CO 2 转化率提高了48.5%，在10Co-Ni/Y 2 O 3 催化剂上有痕量CO。这促进了直接甲烷化反应机制。然而，与双金属催化剂相比，Ni/Y 2 O 3 催化剂的反应机理表现出不同的行为，而甲烷反应的蒸汽重整除了增加H 2 和CO形成外，还与甲烷消耗有关。同温反应。而甲烷反应的蒸汽重整除了增加H 2 和CO 形成外，还与甲烷消耗有关；同温反应。而甲烷反应的蒸汽重整除了增加H 2 和CO 形成外，还与甲烷消耗有关；同温反应。